Walter Samuel McAfee's African-American parents were Luther F McAfee and Suzie A Johnson. Luther McAfee's father was a minister in the Colored Methodist Episcopal Church which had originated from a movement begun in 1866 within the Methodist Episcopal Church, South, from which the black members set up an independent Church. Luther McAfee had been educated at Texas College, which was run by the Colored Methodist Episcopal Church, and then became a carpenter. Walter's mother Suzie was the daughter of a farmer. She came from a well-educated family with one of her brothers, an uncle of Walter, was a medical doctor who had first been awarded a Bachelor's Degree. Suzie had studied at Wiley College in Marshall, Texas, and had qualified as an elementary teacher but she never had a teaching position in a school.

Walter McAfee was the second of his parents nine children. When he was three months old his parents moved from Ore City to Marshall in Harrison county, northeastern Texas. His parents seven other children were all born in Marshall. Although his mother never taught in a school, she did teach all her nine children and she did this well for all nine of them went on to study at college. Walter attended High School in Marshall graduating in 1930. One teacher at the school in particular influenced him:-

The man who taught me chemistry was an excellent teacher and he also taught me physics. His name was Freeman Prince Hodge. I sometimes become emotional when I think about him because when I was finishing high school my mother and father came to see the place and Hodge met them in the hallway. He told them, "I always refer to him as my intellectual giant." I'd never known that he had thought that much of me, except that I know that we were more than just a little friendly.

In September 1930 he entered Wiley College in Marshall where his mother had studied. Again a teacher there was specially influential:-

[McCain] taught me general physics and sophomore mechanics at Wiley College. He was very instrumental in advising me when I first started taking physics as I was talking about taking engineering.

McAfee was awarded a Bachelor's Degree with distinction from Wiley College June of 1934 and began to look for jobs. The Depression had begun in October 1929 but lasted for around ten years so in 1934 jobs were still hard to find. McAfee was only 19 years old so did not worry too much when he did not quickly find a teaching job. he took on a number of temporary jobs such as farm labouring, working as a carpenter's assistant, temporary teaching posts, and working as a door-to-door salesman. He decided during the summer of 1935 to continue his education and wrote to Ohio State University in Columbus, Ohio asking if they had a place for graduate studies and he was instantly accepted.

He travelled to Columbus by bus and told Graduate Admissions:-

I'd like to major in theoretical mathematical physics.

He was immediately given a place and he worked for his Master's Degree under the supervision of Llewllyn H Thomas. He graduated in 1937 and decided to earn money as a teacher while working towards his doctorate:-

I got my Master's in June of '37 and then I taught in a junior high school in Columbus, Ohio. I taught general science, mathematics, and 9th grade biology there for five years from October '37 to April of '42.

During this time he met Viola Winston, who taught French at the same junior high school and they married in 1941. McAfee was a hard worker and most summers when the school was on vacation, he studied high level courses at the university. He wanted to contribute to the war effort and began applying for positions. Applications asked for a photograph to be included and McAfee was rejected several times, almost certainly because he was Black. Eventually he applied to join the Electronics Research Command section of the U.S. Army Signal Corps at Fort Monmouth and this time no photograph was required.

He would have taken leave of absence from his teaching post while taking on this War Service but his school were not prepared to allow this:-

... the assistant superintendent ... in charge of secondary education ... tried to get me to stay. He said, "If you were being drafted to fight the war or if for some particular need, you had some particular talent and they were drafting you to do a job for a certain length of time, we would give you the leave of absence. But we've decided that all of our people with special training or special talents would be leaving us, if we gave them leave of absence. You'll have to resign and when the war is over, you have to come back and apply on the same basis as other people apply." I said, "I think I'll resign."

He became a member of the Project Diana. This project was to attempt to bounce radar signals off the moon. They certainly knew that their task was hard since two previous attempts had failed. McAfee was well qualified to be on this team for he had published papers on radar-echoing areas, radar cross sections and refraction studies in the atmosphere. McAfee did the necessary mathematical calculations to ensure that Project Diana would succeed:-

I computed a radar cross section of the moon, a radar coverage pattern, and distance to the moon, so they could tell how big the signal would be when it returned.

The project was successful and a radar pulse was sent through a special antenna on 10 January 1946, with the echo from the moon being received 2.5 seconds later. The success of the project was publicly announced two weeks later in the New York Times (see [1]). Official reports of the projects success, however, failed even to mention that McAfee was on the team.

After the completion of Project Diana, McAfee was awarded a Rosenwald Fellowship in May 1946 to enable him to complete his doctoral studies at Cornell University:-

I didn't get any of the publicity until after I got the Rosenwald Fellowship to Cornell, which was announced around May or June of that year. The moon radar was announced in January and then in May or June they wrote big articles about me and then they made some nice statements about how I had worked on the theoretical problems connected with radar.

McAfee's Ph.D. was in physics and was supervised by Hans Bethe. He completed the work in 1948 and returned to become Head of the Theoretical Unit of the Nucleonics Section at the U.S. Army Signal Corps at Fort Monmouth. His doctorate was awarded by Cornell in February 1949.

In 1953 he became Head of the Electromagnetic Wave Propagation Section. His interest in teaching, however, meant that when the opportunity arose he took it:-

I taught a course in differential and integral calculus in one summer to all of the engineers who were entering Rutgers that fall. I was surprised, some of these engineers didn't have the slightest idea about calculus. Finally, at the end of the class there were only about four people I would have passed in that course in calculus and there were about twenty-nine or thirty in the class.

In was the first recipient of the Secretary of the Army Research and Study Fellowship in 1956. It was to study radio astronomy and solar physics and was presented to McAfee by President Eisenhower. As part of this Fellowship he worked at Harvard for a year.

McAfee was induced into the Science Hall of Fame at Wiley College in 1982. He retired from the Signal Corps in 1985. In the same year he received the Stevens Award from the Stevens Institute of technology. On 28 July 1997 the McAfee Center was dedicated at Fort Monmouth. It was the first facility of its kind named after a civilian.